Steps to reproduce:

1. Install 6.2
2. Configure https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/media/msteams/media_msteams.yaml?at=release%2F6.2#115

Result:

            if ([0, 1, 2, 3].indexOf(parseInt(params.event_source)) === -1) {
                throw 'Incorrect "event_source" parameter given: "' + params.event_source + '".\nMust be 0-3.';

Expected:
No errors:
https://www.zabbix.com/documentation/current/en/manual/api/reference/event/object

Possible values:
0 - event created by a trigger;
1 - event created by a discovery rule;
2 - event created by active agent autoregistration;
3 - internal event;
4 - event created on service status update.